Preliminary Design Review

1
Preliminary Design Review

• Group Members

• Neil Antonson
• Michael Arnold
• Matthew Calvin
• Dax Minary
• Sonja Nedrud

• Jonathan Nikkel
• Erin Reed
• Andrew Shulman
• Tara Smith

2
Briefing Overview

• Project Objective
• Project Requirements
• Design Alternatives
• Design-to Specifications
• Risk Analysis
• Overall Vehicle Design
• Project Plan
• Questions

3
Project Objective
The objective of this project is to conceive,
design, fabricate, integrate, and test a
deployable, dual-mode sonde system that will
provide multi-unit communications ability and a
vehicle capable of controlled, sustained
flight. This project will be used as a
proof-of-concept for future developments in the
field of autonomous sonde systems.
4
Project Requirements

• Vehicle Requirements
• (to be filled in driving requirements for
  vehicle)
• Avionics Requirements
• (to be filled in driving requirements for
  avionics)

5
Overall System Concept
6
Operational Scenario
Final transmission of ground data
Sonde configuration and Power On
Begin data collection and transmission
Sonde landing and switch to ground mode
0000
0020
3632
0032
0010
0022
3633
Mothership Take Off
Sonde deployment
End of mission
7
Telemetry and Commanding
Servos
Temperature / Humidity Sensor
Pressure / Temperature Sensor
GPS Antenna
Power Regulation Circuits
PCB
Telemetry
Commanding
SONDE PACKAGE
8
Power
Servos
Motor
Antenna 1
Antenna 2
Motor Controller
7.4 or 11.1
Temperature / Humidity Sensor
6
5
Pressure / Temperature Sensor
GPS Antenna
3
5
5
2.7
Power Source
3.3
7.4 or 11.1
3.3
Power
PCB
5
Voltage
SONDE PACKAGE
9
Power Budget
10
Trade Study Key
11
Vehicle Andrew Shulman
12
Design Alternatives
Vehicle Configuration
13
Design Alternatives
Empennage Design
Pictures from OSU DBF (Reference )
14
Design Alternatives
Propulsion
15
Design Alternatives
Deployment Method
16
Design Alternatives
Deployment Method
17
Design Alternatives
Materials Aerodynamic Surfaces
18
Design Alternatives
Materials Fuselage
19
Design-to Specifications

• Vehicle sizing
• Weight restrictions
• Thrust minimum
• Estimated required strength
• MODELING VERIFICATION!!!

20
Vehicle Risk Analysis

• Fault tree?
• Risk Assessment matrix

21
Aerodynamics Risk Analysis
22
Aerodynamics Risk Analysis
Off Ramps
23
Structures Risk Analysis
24
Structures Risk Analysis
Off Ramps
25
Avionics Jonathan Nikkel
26
Design Alternatives
Sensors Pressure
27
Design Alternatives
Sensors Temperature
28
(No Transcript)
29
Design Alternatives
Communications Standard
30
Design Alternatives
Communications Equipment
31
Design Alternatives
GPS Receiver
32
Design Alternatives
GPS Antenna
33
Design Alternatives
Microcontroller

• Solution Atmel ATmega128
• In-house support
• Prior experience
• Full set of existing, easy to use software
  drivers
• Existing hardware solutions
• PICs have no major advantage over Atmels in this
  application
• PIC-based solution would require hardware
  development time

34
Design Alternatives
Microcontroller
35
Design Alternatives
Power Source
36
Design Alternatives
Component Integration
37
Design-to Specifications

• Power requirements
• Maximum avionics weight
• Range requirements
• Sensor accuracy
• MODELING VERIFICATION!!!

38
Hardware Risk Analysis

• Fault Tree?

39
Hardware Risk Analysis
40
Design Alternatives
Top-Level Software Design
41
Design Alternatives
Detailed Software Design
42
Design-to Specifications

• Real-time visualization at ground station
• Vehicle directional controller requirements are a
  MUST for this section!
• What sort of verification will we do? We can try
  to model vehicle response and then see how well
  it performs but is GPS accurate enough to test?

43
Preliminary Software Design
Top-Level Design
Power On
Initialization Polling Loop
Polling Loop Prompts/Feedback
Initialization Inputs
Initialization Complete?
Ground Commands
Ascent Mode
High Rate Telemetry
Drop Command Received?
Ground Commands
High Rate Telemetry
Descent Mode
Is the vehicle stationary? Has it been stationary
for X seconds?
Stored Low Rate Telemetry
Stored Telemetry Dump
Ground Mode
Power Out
44
Preliminary Software Design
Initialization Polling Loop
45
Preliminary Software Design
Ascent Mode
46
Preliminary Software Design
Descent Mode
47
Software Configuration Management

• CVS Make Based System
• CVS (Concurrent Version System)
• Provides package-based revision and source
  control
• Multi-user development environment
• Provides conflict resolution tools
• Make
• Provides simple, controllable, repeatable
  interface to compiler
• Simplifies compilation of multi-file projects
• Eliminates necessity to remember obscure commands
  and options

48
Software Risk Analysis
49
Software Risk Analysis

• Fault Tree?

50
Project Plan Erin Reed
51
Organizational Chart
52
Work Breakdown Structure
53
Schedule Design
54
Schedule Fabrication and Test
55
Budget Estimate
56
Facilities Requests

• Sig Rascal 110
• Table Mountain Test Range
• Aerospace Machine Shop
• Carbon Fiber Manufacturing
• Aerospace Electronics Shop
• Static Thrust Test Stand
• Materials Test Equipment

57
Overall System Risk
58
Conclusions

• Propelled, fixed-wing, conventional aircraft
• Wing mounted deployment from host vehicle
• PCB mounted electronics
• other major conclusions

59
Questions?
60
References
61
Subtitle
Reference